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[英]Ruby-On-Rails How to allow only current user to edit and delete posts they have created
[英]How to allow only the author of a post edit or delete it in Ruby on Rails?
我有一個用戶模型和一個問題模型。
在用戶模型中:
has_many :questions
問題模型:
belongs_to
在我的問題/ show.html.erb
<% if @question.user == current_user %>
<%= link_to 'Edit', edit_question_path(@question) %> | <%= link_to 'Destroy', @question, method: :delete, data: { confirm: 'Are you sure you want to delete this job?' } %>
<%= link_to 'Back', questions_path %>
<% else %>
<%= link_to 'Back', questions_path %>
<% end %>
只有編寫問題的用戶如何編輯並刪除它?
看看CanCan ,這是Railscasts的Ryan Bates的授權瑰寶。 這對Rails授權需求非常有用。
首先,您將創建一個Ability
類,該類定義應用程序中的所有功能。
class Ability
include CanCan::Ability
def initialize(user)
can :manage, Question, user_id: user.id
end
end
然后,您將能夠輕松地將授權集成到您的控制器中。
class QuestionsController < ApplicationController
def update
authorize! :manage, @question
...
end
def destroy
authorize! :manage, @question
...
end
end
並定制您的觀點。
<% if can? :manage, @question %>
<%= link_to 'Edit', edit_question_path(@question) %> | <%= link_to 'Destroy', @question, method: :delete, data: { confirm: 'Are you sure you want to delete this job?' } %>
<% end %>
您在控制器中所需的全部是:
def destroy
@question = current_user.questions.find(params[:id])
@question.destroy
render ... #anything you want to render
end
先前的代碼將確保用戶只能刪除自己的問題。 如果問題的id不屬於用戶,則不會刪除任何問題,它會拋出ActiveRecord::RecordNotFound - Internal Server error
。 您可以添加一個begin - rsecue block
以根據需要捕獲此異常並對其進行處理。
def destroy
begin
@question = current_user.questions.find(params[:id])
@question.destroy
render or redirect_to ....
rescue Exception ActiveRecord::RecordNotFound
flash[:notice] = 'not allow to delete this question'
redirect_to ....
end
end
其他簡單的方法是在控制器中添加一個前置過濾器
before_filter :require_authorization, only: [:delete]
...
def destroy
@question = current_user.questions.find(params[:id])
@question.destroy
render or redirect_to ....
#With the before filter this code is only going to be executed if the question belongs to the user
end
...
private
def require_authorization
redirect_to :root unless current_user.questions.find_by_question_id(params[:id])
#Use the find_by to avoid the ActiveRecord::RecordNotFound and get a nil instead in case the question id doesn't belong to a question of the user
end
您可以嘗試將if
更改為以下內容:
<% if current_user.questions.include?(@question) %>
你也可以看看:inverse_of
然后,在控制器的“編輯”和“刪除”操作中,您可以在顯示編輯表單或刪除問題之前再次檢查合適的用戶。
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